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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Related Experiment Video

Updated: Jun 11, 2026

Polymer Microarrays for High Throughput Discovery of Biomaterials
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Published on: January 25, 2012

A Robotic High-Throughput Grid-Search Platform for Mapping Phase Behavior in Triblock Copolymer-Homopolymer Blends.

Saroj Upreti1, Lan Xu2, Md Moniruzzaman1

  • 1School of Polymer Science and Engineering, Center for Optoelectronic Materials and Devices, University of Southern Mississippi, Hattiesburg, Mississippi 39406, United States.

ACS Nano
|June 9, 2026
PubMed
Summary

Homopolymer molecular weight critically controls domain swelling and disordering in triblock copolymers. This study reveals distinct regimes based on molecular weight, impacting nanostructure formation and phase behavior.

Keywords:
high-throughput processingnanostructure morphologyorder–disorder transitionphase behaviortriblock copolymer thin films

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Published on: June 20, 2019

Area of Science:

  • Polymer Science
  • Materials Science
  • Nanotechnology

Background:

  • Triblock copolymers self-assemble into ordered nanostructures.
  • Understanding phase behavior in blends with homopolymers is crucial for material design.

Purpose of the Study:

  • To investigate the effect of homopolymer molecular weight and blend ratio on the phase behavior of triblock copolymers.
  • To map the order-disorder transition (ODT) boundaries and domain spacing evolution.

Main Methods:

  • High-throughput robotic thin-film processing (NOVA).
  • Grazing Incidence Small-Angle X-ray Scattering (GISAXS) and Atomic Force Microscopy (AFM) for characterization.
  • Coarse-grained molecular dynamics simulations.

Main Results:

  • Three distinct regimes identified based on homopolymer molecular weight: wet-brush, dry-brush, and macrophase separation.
  • Low-MW homopolymers caused gradual swelling; medium-MW homopolymers induced significant swelling and earlier disordering; high-MW homopolymers led to macrophase separation.
  • Simulations confirmed uniform distribution of low-MW homopolymers in their corresponding domains.

Conclusions:

  • Homopolymer molecular weight is a critical parameter governing domain swelling and the ODT in triblock copolymer systems.
  • The high-throughput platform facilitates rapid mapping of composition-morphology relationships.
  • Potential for integration with AI/ML for designing advanced nanostructured polymers.